Don't shy away from becoming a supervisor because you don't possess every required skill. Are you good at explaining things to new coworkers or those learning something new? Do you have good ideas and a way of expressing them in a convincing matter? Do you stay unruffled by politics and frustrations of a bureaucracy? Are you motivated to learn new skills that give you the business acumen necessary to be effective in a managerial role (technology, finance, etc)? If you believe in your organization's purpose and don't fear accountability, and you naturally engage with others and communicate well, then seize your next opportunity to become a supervisor!